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authorPeter Zijlstra <peterz@infradead.org>2015-09-18 13:22:52 +0200
committerIngo Molnar <mingo@kernel.org>2015-09-23 09:54:29 +0200
commite3e72ab80a3fac0b88e07d358a2c75724ccd66b4 (patch)
tree3cc1b2f6fbe8ca8d3649d95d14f7c093cea11480 /arch/m32r/include/asm/Kbuild
parentatomic, arch: Audit atomic_{read,set}() (diff)
downloadlinux-dev-e3e72ab80a3fac0b88e07d358a2c75724ccd66b4.tar.xz
linux-dev-e3e72ab80a3fac0b88e07d358a2c75724ccd66b4.zip
atomic: Implement atomic_read_ctrl()
Provide atomic_read_ctrl() to mirror READ_ONCE_CTRL(), such that we can more conveniently use atomics in control dependencies. Since we can assume atomic_read() implies a READ_ONCE(), we must only emit an extra smp_read_barrier_depends() in order to upgrade to READ_ONCE_CTRL() semantics. Requested-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Will Deacon <will.deacon@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Cc: oleg@redhat.com Link: http://lkml.kernel.org/r/20150918115637.GM3604@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/m32r/include/asm/Kbuild')
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